Revert "rename clanCore to clan.core"

This reverts commit fef796fa6e.

nixosModules/clanCore/flake-module.nix

@@ -0,0 +1,32 @@
+{ self, inputs, lib, ... }: {
+  flake.nixosModules.clanCore = { pkgs, ... }: {
+    options.clanCore = {
+      clanDir = lib.mkOption {
+        type = lib.types.str;
+        description = ''
+          the location of the flake repo, used to calculate the location of facts and secrets
+        '';
+      };
+      machineName = lib.mkOption {
+        type = lib.types.str;
+        description = ''
+          the name of the machine
+        '';
+      };
+      clanPkgs = lib.mkOption {
+        default = self.packages.${pkgs.system};
+      };
+    };
+    options.system.clan = lib.mkOption {
+      type = lib.types.lazyAttrsOf lib.types.raw;
+      description = ''
+        utility outputs for clan management of this machine
+      '';
+    };
+    imports = [
+      ./secrets
+      ./zerotier.nix
+      inputs.sops-nix.nixosModules.sops
+    ];
+  };
+}